Peel & wash potatoes. Chop them into bite size pieces.
Coarsely grind chopped tomatoes into a paste. Set aside.
Break the wadi into small pieces. Do not grind it, just use your hands to coarsely break it.
Heat 1 tsp ghee in a cooker and roast the wadi pieces till golden brown. Remove into a bowl and set aside.
In the same cooker, now heat the remaining ghee. Firstly add asafoetida, then allow cumin seeds to pop.
Now add remaining spices like turmeric powder, coriander powder and red chili powder. Add chopped green chili and tomato paste. Cook for 2-3 minutes till tomato paste starts leaving ghee/ oil.
Now add both potatoes and roasted wadi to the prepared masala. Add 1/4 cup water and salt as per taste.
Pressure cook for 2 whistles on low flame till potatoes are tender.
Garnish as desired. Serve hot with chapatis or paranthas.